Multiple-weight attachment for precision-balances



W. HEUSSER. MULTIPLE WEIGHT ATTACHMENT FOR PRECISION BALANCES.

APPLICATION FILED APR. 4. T918. I

Patented June 29, 1920.

3 SHEETS-SHEET 1- ATTORNEY w. HEUSSER. MULTIPLE WEIGHT ATTACHMENT FOR PRECISION BAL ANCES. APPLICATION FILED APR. 4. I918.

Patented June 29, 1920.

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IIIHIIHI IIIII INVENTOR /W/ //7'df/eu.5.56 7

K ATTORNEY W. HEUSSER. MULTIPLE WEIGHT ATTACHMENT FOR PRECISION BALANCES- APPLICATION FILED APR. 4, 1918.

Patented J une29, 1920.

3 SHEETS-SHEET 3- Q an m Q w v w x E G W E T ORNEY UNITED STATES PATENT OFFICE.

WILFRID'HEUSS'ER, OF SALT LAKE CITY, UTAH,

MULTIrLE wEIH'r ATTACHMENT roa PRECISION-BALANCES.

Specification of Letters Patent. Patented J 11119 29, 1920.

Application filed April 4, 1918. Serial No. 226,766.

and State of Utah, have invented certain new and useful Improvements in Multiple- Weight Attachments for Precision-Balances,

of which the following, together with the accompanying drawings, constitutes a full, clear, and exact specification, which will enable others skilled in the art to which my invention appertains to make and use the same. I

My invention relates to improvements in multiple weight attachments for assay or analytical balances and its principal object is to provide improved facilities for easily and quickly applying very small weights to, or withdrawing the same from the balance, without unduly disturbing its equilibrium. 7

The features upon which protection is desired are collectively grouped in the appended claims.

In the drawings Figure 1 represents a portion of an ordinary assay balance embodying my improve ment. 5 1

Fig. 2, a transverse vertical section thereof and Figs; 3, 4, 5, 6 and 7, fragmentary views showing various details.

Fig. 8 represents a section taken on line 88 in Fig. 9, illustrating struction of my device, and

Fig. 9 is a transverse vertical section thereof. I

Throughout the different views similar parts are designated. by similar numerals.

Referring to the drawings (11) represents a portion of the base, and (12). a portion of the beam, of an ordinary balance. The pan hanger (13) is suspended from one end of the. beam in the usual manner, but the hanger is somewhat longer than is generally used, so as to provide the necessary space between the pan (1 1) and the top of the hanger for accommodating the perforated plate or grid (15) and the extremities of the arms 16, 17, 18, etc. p

These arms have their, rear ends fulcrumed on the shaft 26, the latter being sup ported, by the standards 25, which are rigidly mounted on the balance-base 11 in any suitable manner. The arms 16,17, 18, etc., arespaced' apart from each other and from the standards 25 by the fiber friction a modified con washers 27 strung on the shaft 26. Those washers 27, which are located between any pair of the arms 16, 17, 18, etc., have interposed the short arms 28 which are also strung on the shaft 26. A. pin 29 passes through the standards 25 and through the depending arms 28, thus preventing'the latter from havlng any movement around the shaft 26, so that no motion can be communicated from one arm to its neighbor. The arms 16, 17,18, etc., together with the interposed washers 27 and arms 28 are snugly wedged'in between the standards 25, so as to hold the arms in position under yielding pressure.

Near their forward ends the arms 16, 17, 18, etc., carry respectively the conically tipped stafi's 16, 17 18 etc., these being so arranged that when the arms are moved up and down the conical tips will pass centrally, or nearlyso, through the corresponding holes in the grid 15.

Near their fulcrum, the arms 16, 17 18, etc., have "pivoted, downwardly extending connecting rods 30, which also pivotally engage the arms 32 of a series of hell cranks, 32, having a common fulcrum on the shaft 33, the latter being supported by the depending-standards 35, rigidly attached to The pin 38 passes through the upper extremities of arms 37.

The arms 32 of the bellcranks 32, have pivoted thereto, the rear ends of adjustable connecting rods 39, theforward ends thereof being pivoted to the depending arms 16",

17 18, etc.,,which form parts of the depressible keys 16", 17, 18 etc., these being fulcrumed on the shaft 40.

The shaft 410 is supported in the bracket 17, 18, etc., and furthermore hasjalso formed therein the slots 43, these being in: termediate the first named slots, thus providing theleaves 44, Figs. 4. and 6. on

41, which is preferably made of cast metal either side of each key 16, 1.7, 18, et-.., (Fig. 4), is a fiber friction washer 4,-5.3, both of which, together with the interposed key, are tightly fitted into position between two of the leaves n, the latter thereby exerting a yielding pressure on the friction washers 45 and therefore also against the keys 16", 17, 18, etc.

The arms 82 and the arms 16", 17, 18 etc, have V-shaped aws at their lower on tremities, as shown in Figs. 2 and 7, in order to receive the ends of the rods and these are connected thereto by the pins Fig. 7 shows an enlarged detail of one of the V-shaped jaws and the pin 31 engaged by an end of one of the rods 89.

The balance-base 11 is supported on the usual leveling screws (not shown), which provides sufficient space for the operating parts under the base.

The upward travel of the keys 16, 17, 18 etc, may be limited by coming in contac with the underside of the base 11, (l? 1 and 2), and the downward travel of the keys may be limited by the bracket all.

In use, the weights 1.6, 17*, 18, etc, which are preferably in the form of circular washers of varying thicki'iesses, are poised on the conical tips of the stalls, in the order corresponding to any denominations to which the keys 16, 1'7, 18, etc, may be indexed, the latter in their normal positions being pushed up close against the underside of the base 11.

Normally, the weights are held high enough above the grid 15 to be clear of the same at the uppermost point of the vibration of the balance.

lVhen it desired to use a certain weight, the operator depresses the correspm'uling key, the depressed position being indicated by dotted lines in Fig. 2, this action depositing the weight on the grid 1.5, while the staff is carried down to its lowermost position, where the conical tip will be entirely clear of the grid.

hen it is desired to remove a weight from the grid, the operator elevates the corresponding key, this action causiug the stall to lift the weight off the grid and to carry it back to the normal position, the key and the parts controlled by it, being prevented from dropping back, by the various friction washers under yielding pressure, as described.

Any necessary adjustments to ix the extreme travel of the weight-carrying stalls may be effected by the sleeves 4.6, which engage the rods 39.

Those parts of my device which are located above the base 11 are inclosed by the usual glass case 52, (Fig.2) common to all balances and at 52 is a felt dust guard through which the rods 30 have their movement.

Fl 's. 8 and 9 illustrate a simplified construct on of this invention, in which the arms 16, 17, 18, etc, are operated from above instead of being operated from below.

The rods l6, 17, 18 etc., at their lower extremities, are pivoted to the arms 1(3, 17, 18, etc., and extend through guide holes in the top 47 of the balance-case, each rod being surrounded by the felt dust guard 45 At l-S are adjustable finger pieces, forming at the same time, steps for limiting the downward travel of the rods l6, 1?, 72%, etc., the upward travel of these rods being limited by the adjustable collars 50.

The friction. washers 27, short arm standards 25, etc, have already been scribed. The standards have set srre 51, which may be tightened upon the 1 26, allowing the standards to be F gether and secured under pressure, against the washers 27, thus prcducin' sulli friction to hold the arms 16, 1'7, LS, etc, in any position.

Having fully described my invention, what I claim is;

1.. In a multiple weight attaclnnent for balances, the combination with the balance structure, of a suitably disposed grid having perforated depressions therein, washer-like weights adapted to rest in the said depressions, a plurality of suitably formed stalls adapted to move up and down through the perforations in the said grid, arms for supporting the said stalls, a plurality of operaing keys suitably fulcrumed, means for frictionally holding the said keys under yielding pressure and means for communicating motion from the said. keys to the said arms.

2. In a multiple weight attaclnmnit, the combination with a balance having a base and an oscillating beam with a pan hanger suspended therefrom, of a perforated grid attached to the said pan hanger, washer- ]ike weights adapted to rest in the perforations of the said grid; (flOlllClLllY tipped stalls adapted to engage the said washer-like weights, fulcruined levers adapted to allow mounting of the said stalls near the free ends thereof, the said levers being positioned to permit the tips of the said starlli's to be moved up and down through the con responding perforations in the said grid; a standard rigidly mounted on the said base and adapted to carry the fulcrum of the said levers, suitably disposed bell cranks with pivoted connecting rods extending from the said levers to arms of the said bell cranks; indexed depressible keys suit ably pivoted, with arms extending there from, and adjustable connecting rods extending from the other arms of the said bell cranks to the arms of the said depressible keys, all as specified.

3. In a multiple weight attachment for balances, the combination with the balance structure, of a horizontally disposed grid having countersunk .holes therein, the walls of the holes sloping inwardly from top to bottom; washer-like weights adapted to rest on the said sloping walls andtobe centered thereby with the vertical axes of the said holes; staffs with conical tips adapted to engage the said weights; pivoted arms for supporting the said staffs; suitably disposed bell cranks with connecting rods extending to the said arms; and a series ofdepressible operating keys with adjustable connecting rods extending therefrom to the said bell cranks, the entire combination being so arranged that any of the said washerlike weights may be deposited on, or lifted from, the said grid, by moving the corresponding operating keys.

' 4. In a multiple weight attachment for balances having a suitable pan hanger, a grid having openings for receiving weights, staffs adapted to move up and down through the saidopening, fulcrumed arms on which the staffs are mounted, the combination therewith, of means for frictionally holding the said arms under yielding pressure, and means for preventing the communication of motion from one of the said arms to an ad jacent arm.

5. In a multiple weight attachment for balances having a grid, pivoted arms .arranged adjacent to each other and carrying staffs adapted to move up and down through openings in the said grid, and depressible reys for operating the said arms, the combination therewith, of means for tractionally holding the said arms in anydesired position, and means for preventing any one of the said arms from communicating motion to an adjacent arm when the key corresponding to the first-mentioned arm is operated.

6. In a device of the kind described, the

combination with a balance having a base and an oscillating beam with a pan-hanger suspended therefrom, of a perforated grid attached to the said hanger, washer-like weights adapted to rest over the perforations of the said grid, conically tipped staffs adapted to engage the said washer-like weights, fulcrumed levers adapted at their free ends to carry the said staffs, the said levers being positioned to permit the tips of the said staffs to be moved up and down through the corresponding perforations in hanger', pivoted arms arranged adjacent each other and carrying staffs adapted to move up and down through openings in the said grid and depressible keys for operating the said arms, the combination therewith,

of means for holding the said arms in any desired positlon under ylelding pressure, and means for preventlng any one of the 7 said arms from communicating motion to an adjacent arm.

8. In a multiple weight attachment for balances having a grid carried by a panhanger, pivoted arms arranged adjacent each other and carrying staffs adapted to move up and down through openings in the said grid and depressible keys for operating the said arms, the combination therewith,

of means for preventing any one of the said arms from communicating motion to an adjacent arm whenv the depressible key corresponding to the first-mentioned arm is operated.

In testimonythat I claim this invention as my own, I aflix my signature in the presence of two subscribing witnesses.

. WILFRID HEUSSER.

Witnesses:

P. H. MALLINGKRODT, P. SGI-IULTE. 

